Senate Republicans gave up on their last-ditch bid to repeal Obamacare Tuesday as opposition in their own ranks ended months of fruitless efforts to deliver on a seven-year promise, and leaders said they would turn instead to overhauling the U.S. tax system.

Senate Republicans making one last-ditch effort to repeal Obamacare have the daunting task of assembling 50 votes for an emotionally charged bill with limited details on how it would work, what it would cost and how it would affect health coverage — all in 12 days.

Senate Republican leaders trying to break a logjam on their proposed health-care legislation are working with congressional budget officials to examine the impact of various changes they’re considering, a process that could take about two weeks, according to a GOP aide.

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